lichen

地衣；青苔英释中释na grey, green, or yellow plant that spreads over the surface of stones and trees

使长满地衣中释vt

1 lichen planus,扁平苔癣

1 In recognition of their vulnerability, the lichen fields have been marked off on maps and with fences..人们意识到它们的脆弱，因此地衣区被从地图上标注出来同时也被栅栏围起来。

2 The lichen tests were conducted in Spain and at Utah’s Mars Desert Research Station, where two of the researchers donned spacesuits and lived for two weeks in the field as astronauts..这些地衣测试是在西班牙和犹他州的火星沙漠研究站进行的。 两个研究人员穿着者宇航服如同宇航员般的过了两周。